Primarily Gerber RS274X (also known as embedded apertures or extended Gerber). Apertures and advanced commands are implemented inside the file.

We can also handle Gerber RS274D (Apertures in a separate file). Although the above two formats being the most commonly used we are also able to handle a number of other more rarely used files.

Drill file format: Excellon or Sieb & Meyer 

Zip file

We strongly recommend you to zip all files for a board to an archive file. This simplifies handling for us, and also makes it a lot safer and faster.

Do not design the board unnecessarily complicated, and use minimum lines and spacing only where it is needed.

When using ground planes together with conductors it is good advice to be somewhat more generous with spacing, since the total length becomes very long thus increasing the possibility for a short.
Inner layers
It is imperative to maintain a big enough spacing from the edge of a hole to the Cu of another net. This applies to both PWR/GRND and signal inner layer regardless whether the hole has a land or not.

Graphic example: We recommend E to be 0.3-0.35 mm on a standard board.

On the page "Technology classes" under "Space, inner – outer layer" you will find the most commonly used distances.

Solder mask
Normal spacing around pads is 3-4 mil. However in some cases like for example BGA capsules we advise you to follow the recommendation made by the supplier. In this case the opening can be substantially less sometimes even negative. (Solder mask defined pads).
Graphic example A shows the clearance.


It is optimal, if possible to have the Cu surface evenly distributed over the entire board. It can be risky to design for example a 4-layer board where layer 3 is a ground plane and layer 2 is a signal layer with almost no Cu around lines. This design can make the board bend in production or when soldered.


It is good practice to mark the layers in the Cu  like 1,2,3,4 etc. or L1,L2 etc.

Outline / Routing
A drawing included to gerber data would be preferable.
It can also be done by adding drawing lines in one of the layers, where center of actual layer with added drawing is the board outline.
If the board is to be delivered on panels make sure that there is enough space for routing, breakaway tabs or v-scoring whichever is to be used.
When routing inner radiuses keep in mind that a router diameter 2.0 mm makes a radius of 1.0 mm. It is possible to use a smaller router however this raise the price.